Run results for: querySelector vs get First Element By Class Name

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.116 Safari/537.36

Browser: Chrome 83

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
querySelector	1670700.0 Ops/sec
getElementsByClassName[0]	1092603.1 Ops/sec

HTML Preparation code:

<div class="test"></div>
<div class="test2"></div>
<div class="test3"></div>
<div class="test4"></div>

AخA
 
<div class="test"></div>
<div class="test2"></div>
<div class="test3"></div>
<div class="test4"></div>

Tests:

querySelector
document.querySelector(".test")
document.querySelector(".test")
getElementsByClassName[0]
document.getElementsByClassName(".test")[0]
document.getElementsByClassName(".test")[0]